I have a large number of rasters (300+) I would like to average using Raster Calculator as is explained at Averaging set of rasters using Raster Calculator of ArcGIS Desktop? I know I can manually select each raster by double-clicking, hitting the '+' key, and then dividing by the total number of files.
Is there a less tedious way to get the average raster, without having to double-click and hit "+" hundreds of times? (or typing each raster's filename into the box, or something similarly tedious)